Dynamic Subframe Bundling for Multicast Video
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Solution Overview
Problem
Existing wireless communication systems face challenges in providing reliable real-time video streaming to multiple users, as they often experience poor reception and errors due to inadequate subframe allocation, leading to a suboptimal quality of experience.
Innovation Solution
A communication system that dynamically adjusts the number of transmission subframes based on reception reports from wireless devices, increasing subframes when a threshold of poor reception is met and decreasing them when satisfactory, using adaptive streaming techniques like MPEG-DASH to ensure high-quality playback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed number of transmission subframes is allocated for multicast video, then system complexity is reduced, but video reception quality deteriorates due to inadequate subframe allocation under varying network conditions
Solution Approach 1:
The patent implements dynamic subframe bundling where the number of transmission subframes is adjusted in real-time based on reception quality feedback. The system transitions from static subframe allocation to dynamic adaptation, allowing the multicast service to respond to changing network conditions and user reception quality, thereby resolving the contradiction between reliability and complexity.
Solution Approach 2:
The patent establishes a feedback mechanism where reception quality reports from wireless devices are collected and used to adjust subframe allocation. This closed-loop control system enables the network to automatically optimize transmission parameters based on actual reception conditions, improving video quality without requiring complex manual configuration.
2Reliability
If the number of transmission subframes is increased to improve reception quality, then video quality improves, but transmission time and resource overhead increase
Solution Approach 1:
The system dynamically adjusts subframe bundling based on actual reception needs rather than using a fixed high allocation. When reception quality is sufficient, fewer subframes are used, reducing transmission time. When quality degrades, subframes are increased only to the necessary level, optimizing the trade-off between reliability and time efficiency.
Solution Approach 2:
The patent changes the transmission parameter (number of subframes) based on reception quality metrics. By adjusting this parameter dynamically rather than maintaining a constant high value, the system achieves good reception quality only when necessary, thereby minimizing overall transmission time and resource overhead.
3Adaptability or versatility
If subframe allocation is adjusted dynamically based on reception reports, then video streaming quality improves, but system control complexity increases
Solution Approach 1:
The patent uses a feedback-based control mechanism where simple reception quality indicators from devices trigger predefined adjustment rules for subframe allocation. This approach provides adaptability through automated response to changing conditions while keeping control complexity manageable through rule-based decision logic rather than complex algorithms.
Solution Approach 2:
The system enables self-adjustment of transmission parameters based on automatic reception quality monitoring and pre-configured adjustment policies. The multicast service automatically adapts to network conditions without requiring complex manual intervention or sophisticated control algorithms, achieving adaptability with controlled complexity.
Data Source
AI summary
Video is multicast to a group of wireless devices as a series of video segment files containing the video frame data for a period of the video stream. After receiving a video segment file, the wireless devices report about the quality of their reception of the video segment. If a threshold percentage (or number) of wireless devices report they experienced poor reception of a video segment, the number of subframes (i.e., transmission time intervals) used in a frame to multicast the video is increased. In other words, if the number of wireless devices that report they experienced poor reception of a video segment is higher than some threshold, the number of subframes allocated to redundantly transmit the streaming video data is increased.